Yesterday I rode to work, got off the bike and left the switch on. When I came out to go home the battery was dead, totally dead. I got a jump start and then rode home and put it on the charger overnight. My question is, how resilient are these batteries? Did I ruin it by running it down so far? I'm going on a week long trip in a month and would rather replace it now than wait until I'm in the middle of nowhere and have to wait for someone to come get me.